Several fixes

* Refactored BaseModel for efficiency
* Added plugin metaclass to keep track of plugin types
* Moved plugins to examples dir (in a previous commit)
* Simplified validation in parse_params
* Added convenience methods to mock requests in tests
* Changed help schema to use `.valid_parameters` instead of `.parameters`,
which was used in results to show parameters provided by the user.
* Improved UI
    * Added basic parameters
    * Fixed bugs in parameter handling
    * Refactored and cleaned code

tests/test_client.py

@@ -1,24 +1,9 @@
 from unittest import TestCase
-try:
-    from unittest.mock import patch
-except ImportError:
-    from mock import patch
-
-import json
 
+from senpy.test import patch_requests
 from senpy.client import Client
 from senpy.models import Results, Plugins, Error
-from senpy.plugins import AnalysisPlugin, default_plugin_type
-
-
-class Call(dict):
-    def __init__(self, obj):
-        self.obj = obj.serialize()
-        self.status_code = 200
-        self.content = self.json()
-
-    def json(self):
-        return json.loads(self.obj)
+from senpy.plugins import AnalysisPlugin
 
 
 class ModelsTest(TestCase):
@@ -29,20 +14,18 @@ class ModelsTest(TestCase):
     def test_client(self):
         endpoint = 'http://dummy/'
         client = Client(endpoint)
-        success = Call(Results())
-        with patch('requests.request', return_value=success) as patched:
+        with patch_requests(Results()) as (request, response):
             resp = client.analyse('hello')
             assert isinstance(resp, Results)
-        patched.assert_called_with(
+        request.assert_called_with(
             url=endpoint + '/', method='GET', params={'input': 'hello'})
-        error = Call(Error('Nothing'))
-        with patch('requests.request', return_value=error) as patched:
+        with patch_requests(Error('Nothing')) as (request, response):
             try:
                 client.analyse(input='hello', algorithm='NONEXISTENT')
                 raise Exception('Exceptions should be raised. This is not golang')
             except Error:
                 pass
-        patched.assert_called_with(
+        request.assert_called_with(
             url=endpoint + '/',
             method='GET',
             params={'input': 'hello',
@@ -54,12 +37,11 @@ class ModelsTest(TestCase):
         plugins = Plugins()
         p1 = AnalysisPlugin({'name': 'AnalysisP1', 'version': 0, 'description': 'No'})
         plugins.plugins = [p1, ]
-        success = Call(plugins)
-        with patch('requests.request', return_value=success) as patched:
+        with patch_requests(plugins) as (request, response):
             response = client.plugins()
             assert isinstance(response, dict)
             assert len(response) == 1
             assert "AnalysisP1" in response
-        patched.assert_called_with(
+        request.assert_called_with(
             url=endpoint + '/plugins', method='GET',
-            params={'plugin_type': default_plugin_type})
+            params={})